64446222264391 has 4 divisors (see below), whose sum is σ = 70304969742984. Its totient is φ = 58587474785800.

The previous prime is 64446222264349. The next prime is 64446222264409. The reversal of 64446222264391 is 19346222264446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64446222264391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64446222261391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2929373739280 + ... + 2929373739301.

It is an arithmetic number, because the mean of its divisors is an integer number (17576242435746).

Almost surely, 2^{64446222264391} is an apocalyptic number.

64446222264391 is a deficient number, since it is larger than the sum of its proper divisors (5858747478593).

64446222264391 is a wasteful number, since it uses less digits than its factorization.

64446222264391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5858747478592.

The product of its digits is 23887872, while the sum is 55.

Adding to 64446222264391 its sum of digits (55), we get a palindrome (64446222264446).

The spelling of 64446222264391 in words is "sixty-four trillion, four hundred forty-six billion, two hundred twenty-two million, two hundred sixty-four thousand, three hundred ninety-one".